If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos. Safari 7.0.6 and related security updates and bug fixes are also included in the OS X 10.9.5 update. All Mac users running Mavericks can find the update available through the Mac App Store, accessible via the Apple menu and by choosing “Software Update”. Download Mac OS X 10.9.5 from the App Store and create a new USB with the SFOTT tool, then reboot to it and do an in-place-upgrade. I just did this with a Mac Mini and it worked flawlessly.
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